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InvisibleArp
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Registered: 04/20/98
Posts: 2,191
Loc: in a van by the river
Re: Quest for a fully automatized climate [Re: Erik006]
    #8030568 - 02/16/08 09:30 AM (15 years, 11 months ago)

phew thanks for the info. won't be trying then


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: Erik006]
    #8030934 - 02/16/08 11:39 AM (15 years, 11 months ago)

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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8035618 - 02/17/08 09:39 PM (15 years, 11 months ago)

For a cheap, accurate temperature/RH sensor sensirion's SHT11 looks like the way to go. I finally got my sample months after I submitted it. The only problem with this sensor is that is has SMD connections which you really need to have a circuit board to mount it on. I'm going to make a HCL/h202 bath and print some simple ones out. If any of you are also working with this same sensor PM me with interest and I will print out a big batch.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: cosmoline]
    #8036891 - 02/18/08 07:42 AM (15 years, 11 months ago)

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Offlinejoesmithjoe
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Registered: 01/27/05
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8052081 - 02/21/08 02:12 PM (15 years, 11 months ago)

I am really interested in this. I am planing on trying my had at designing a tec. that makes it almost as easy to grow pan as it is to grow cubs. The hardest part is getting the humidity right during fruiting imo so a project like this would cure that problem.


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cubies are for kiddies, grow pans!


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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8052232 - 02/21/08 02:56 PM (15 years, 11 months ago)

Quote:

poke smot! said:
cosmoline, there are SHT71's which have leads and do not require any smt stuff.






they have leads but are only accurate to 80% rH.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: cosmoline]
    #8052617 - 02/21/08 04:32 PM (15 years, 11 months ago)

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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8055046 - 02/22/08 01:47 AM (15 years, 11 months ago)

Quote:

poke smot! said:
That is what the data sheet says. They do read up to 99%. With the internal condensation heater it seems these are very close to readings that were obtained using a small digital hygrometer similar to the ones people are using in their terrariums already.




Those hydrometers don't use digital humidity sensors, its all analog. If you want real accuracy you gota go digital. I'm gona stick with the sht11 or even better sht10. I already have circuit board layouts and will have them printed this weekend. The best part of using these is that the sht10 is only like 10$ from china and is accurate to 100%. This project is coming along well for me, expect to see good things from me in the future.


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OfflineLoWgRoW
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Registered: 09/22/07
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Re: Quest for a fully automatized climate [Re: cosmoline]
    #8055468 - 02/22/08 08:22 AM (15 years, 11 months ago)

again great work! I can't wait to see how it in action.


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OfflineShibariSmurf
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Re: Quest for a fully automatized climate [Re: cosmoline]
    #8201492 - 03/27/08 01:07 PM (15 years, 10 months ago)

I'm in the final stages of putting together the arduino SHT71 system. My test show that the 71 is accurate within 2% when RH is over 90% (ie. if RH=90% than it reads 88% or 92%) this is within what I'm looking for so it works just fine and is better than the data sheet indicates.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: ShibariSmurf]
    #8202215 - 03/27/08 04:47 PM (15 years, 10 months ago)

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Offlinetheratatat
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Registered: 03/09/07
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8271706 - 04/11/08 09:48 PM (15 years, 9 months ago)

I just thought I would add my two cents to this one, even though its late in the game.

I am actually using the SHT11 for controlling humidity with an ultrasonic transducer. I have attached a screenshot of the web interface I built for it.



As you can see I am able to keep my humidity fairly even with this sensor. I am really happy with this sensor, except for a I had one crap out on me really early and had to send for a new one.

I have indeed wrapped my sensor in tyvek and have had really good luck since then. It doesn't really hurt the response time much.

Cheers


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